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test/jdk/java/util/Optional/BasicInt.java
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@@ -30,10 +30,12 @@
*/
import java.util.NoSuchElementException;
import java.util.OptionalInt;
import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.IntPredicate;
+import java.util.List;
import static org.testng.Assert.*;
import org.testng.annotations.Test;
public class BasicInt {
@@ -50,10 +52,12 @@
assertFalse(empty.equals(OptionalInt.of(UNEXPECTED)));
assertFalse(OptionalInt.of(UNEXPECTED).equals(empty));
assertFalse(empty.equals("unexpected"));
assertFalse(empty.isPresent());
+ assertTrue(empty.isEmpty());
+
assertEquals(empty.hashCode(), 0);
assertEquals(empty.orElse(UNEXPECTED), UNEXPECTED);
assertEquals(empty.orElseGet(() -> UNEXPECTED), UNEXPECTED);
assertThrows(NoSuchElementException.class, () -> empty.getAsInt());
@@ -125,6 +129,22 @@
@Test(groups = "unit")
public void testStreamPresent() {
assertEquals(OptionalInt.of(INTVAL).stream().toArray(), new int[] { INTVAL });
}
+
+ @Test(groups = "unit")
+ public void testIsEmpty() {
+ OptionalInt empty = OptionalInt.empty();
+ assertTrue(empty.isEmpty());
+ OptionalInt present = OptionalInt.of(1);
+ assertFalse(present.isEmpty());
+ var integerList = List.of(1,2,3,4,5);
+ IntPredicate isPositiveNumber = x -> x > 0;
+ IntPredicate isNegativeNumber = x -> x < 0;
+ OptionalInt positiveNumber = integerList.stream().mapToInt(Integer::intValue).filter(isPositiveNumber).findAny();
+ OptionalInt negativeNumber = integerList.stream().mapToInt(Integer::intValue).filter(isNegativeNumber).findAny();
+ assertFalse(positiveNumber.isEmpty());
+ assertTrue(negativeNumber.isEmpty());
+ }
+
}
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